How To Fix SCTS_AIM066 - Lock mode conflict (&2 <-> &3) for table &1 with configuration task &4

SAP Error Message - Details

• Message type: E = Error

• Message class: SCTS_AIM - Messages for the AIM meta data repository

• Message number: 066

• Message text: Lock mode conflict (&2 <-> &3) for table &1 with configuration task &4

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SCTS_AIM066 - Lock mode conflict (&2 <-> &3) for table &1 with configuration task &4 ?

  The SAP error message SCTS_AIM066 indicates a lock mode conflict for a specific database table during a configuration task. This error typically arises when multiple processes or users are trying to access or modify the same database table simultaneously, leading to a conflict in lock modes.
  Cause:
  
  Concurrent Access: The most common cause of this error is that two or more sessions are trying to access the same table with conflicting lock modes. For example, one session may be trying to write to the table while another is trying to read from it.
  Long-Running Transactions: If a transaction takes too long to complete, it can hold locks on the table, preventing other transactions from accessing it.
  Configuration Task: The error is specifically related to a configuration task, which may involve changes to the database schema or data that require exclusive access to the table.
  
  Solution:
  
  Identify the Locking Sessions: Use transaction codes like SM12 (to view and manage locks) to identify which sessions are holding locks on the table in question. You can check for the user sessions that are causing the conflict.
  Terminate Conflicting Sessions: If you identify sessions that are holding locks unnecessarily, you may need to terminate those sessions. This can be done from the SM12 transaction by selecting the relevant locks and choosing to delete them.
  Retry the Configuration Task: After resolving the lock conflict, retry the configuration task that was initially causing the error.
  Optimize Long-Running Transactions: If the issue is due to long-running transactions, consider optimizing those transactions to reduce their execution time and minimize the time locks are held.
  Schedule Maintenance Windows: If possible, schedule configuration tasks during off-peak hours when fewer users are accessing the system to reduce the likelihood of lock conflicts.
  
  Related Information:
  
  Lock Modes: Understand the different lock modes (e.g., shared, exclusive) and how they interact. This knowledge can help in diagnosing and preventing lock conflicts.
  Database Performance: Regularly monitor database performance and lock statistics to identify potential issues before they lead to conflicts.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  Documentation: Review SAP documentation on database locking mechanisms and best practices for managing concurrent access to database tables.
  
  By following these steps, you should be able to resolve the SCTS_AIM066 error and prevent it from occurring in the future.